The Vism SPD solar combat red dot reflex optic sight in black can run off the sun via the solar cell on top of the red dot sight or the onboard AAA Battery (included). This combat red dot reflex optic features flip open lens caps, five brightness settings for the red dot reticle in battery mode. Unlimited eye relief for flexible mounting positions on the firearm. Includes a low rail mount and a high quick release rail mount for mounting onto weaver/ Picatinny/ MIL-STD 1913 type rails. The base of the optic is compatible with (Most) Aimpoint® Micro Mounts. Ncstar Vism Lifetime Limited Warranty.